Baker s oven



No. 609,9I9. Patented Aug. 30, |898.

W. E. STEFFLER.

BAKERS OVEN.

(Application filed July 24, 1897.)

(N o M o d e l JKM/5" 'm @WMMW wwwa/Yy NiTED STATES PATENT Prion.

BAKERS OVEN.

SPECIFICATION forming part of Letters Patent No. 609,919, dated August30, 1898.

Application tied July 221, 1897.

To a/ZZ whom it may concern.-

Beit known that I, WILLIAM E. STOEFFLER, a citizen of the United States,residing at the city of Philadelphia, in the county of `Philadelphia andState of Pennsylvania, have invented certain new and useful Improvementsin Bakers Ovens, of which the following is a specification. i

The object of my invention is to provide a comparatively inexpensive,safe, and efficient attachment applicable to the most usual andinexpensive type of bakers ovens and which adapts them without anyincreased consumption of fuel to produce bread of as good quality ascanbe baked in the most expensive ovens, which by reason of their high irstcost and subsequent consumption of large quantities of fuel are possibleonly in large establishments.

To this end my invention, stated in general terms, comprises an ordinarybakers oven provided in the wall of its re-box with a water-back and inthe rear wall of its bakingchamber with a box for discharging live drysteam and equipped with an exposed or accessible boiler and itscomplemental accessories and pipe connections, as is hereinafter morefully set forth. v

The nature, characteristic features, and scope of my invention will bemore fully understood from the following description,taken in connectionwith the accompanying drawings, forming part hereof, and in which-Figure l is a top or plan view'of an ordinary bakers oven with parts ofthe superstructure broken away so as to illustrate parts embodying`features of my invention.A Fig. 2 is a front elevational view of thefurnace with parts broken away for a like purpose. Fig. 3 is a sectionalview of a steambox hereinafter described, and Fig. 4 is a front view ofthe steam-box With parts broken away so as to illustrate the interiorconstruction.

I shall first describe a type of oven to be found in the majority ofcomparatively small shops and to which my invention is particularlyapplicable, although it can be applied to different types of ovens.

Referring to the drawings, a is a bakers oven suitably constructed ofmasonry and the like. It is provided with a baking-chamber Serial No.645,776. (No model.)

b, communicating with a replace c. The fireplace c is provided with asuitable grate c', ash-pit, and doors c2. The chamber b hascommunication with iiues d and d', formed in its roof or crown, andthese flues in turn communicate with a chimney e and are or may beprovided with dampers f, having operating-handles f. Provision may alsobe made, as at g, for a light and at g for adoor, through which theilues can be cleaned. In use a re is kindled in the fire place or box c.The hot products of combustion traverse the baking-chamber b, flues dd', and escape by way of the chimney or offtake e., thus heating up thebaking-chamber.

Having thus pointed out the construction and indicated the mode ofoperation of a known type of oven to which my invention is applicable, Iwill now proceed with a description of the latter. In the wall of thefire place or chamber c I provide one or more water-backs, one, l, beingshown. This waterback is of usual or any preferred construction and ispreferably located flush with the wall of the fireplace c in suchposition as to receive heat from the iire that would otherwiserbeabsorbed by the brickwork. At some suitable point outside of the oven Ilocate a boiler 2, This boiler is of the type usually employed inkitchens, and it may be supported upon a suitable bracket, shelf, orcornice, as 3. The fact that the boiler is exposed is important, becauseit permits of its ready examination.

4c is an inlet-pipe that receives water from a street-main, elevatedcistern, or tank or other suitable source of supply and leads into thewater-back l. From the water-back l extends a pipe 5, that leads to theboiler 2 and serves to convey hot water from the water-back to theboiler. From the boiler 2 leads a pipe 6, that communicates with thewater-back l by way of the pipe 4. The pipe l 4f, water-back l, pipe 5,boiler 2, and pipe 6 constitute a circulating hot water system that isperfectly safe and very reliable. I'I-ot water and steam may be takenfrom this circulating system for heating the dwelling, supplying thesame with hot water, and for a purpose to be hereinafter mentioned. Theboiler 2 may be provided with a sight gage 7, a pressure-gage 8, asafety-valve 9, and a valved blow-off pipe 10, that leads to a suitablepoint of discharge-for example, into the open air. In the rear wall ofthe baking-chamber b is a steam-box 1l. This box is provided with abafIle-plate 12, that does not extend clear across it, so as to leavepassages 13 for steam and so as to prevent the escape of entrained waterand cause it to collect in the bottom of the box. The box is alsoprovided with an inlet 14 for steam and with openings 15, through whichsteam is discharged into the oven. By locating the box 11 flush with theflue d heat from the latter is available for superheating steam, as wellas for vaporizing Water that may collect in the bottom of the box.

16 is a valved pipe leading from the boiler 2 to the steam-box 1l. Thepresence of the steam-box and its accessories affords means forsupplying dry steam to the interior of the bake-oven, and this steam isknown to beneficially aifect the quality of the bread. The location ofthe steam -box at the rear of the oven and its provisions fordischarging steam toward the front thereof have the effect to preventgases and hot products rising from the fireplace from entering the oven,so that bread located comparatively near the fireplace is perfectlybaked, and neither burned nor otherwise spoiled. The whole arrangementiseasy and inexpensive of application, is readily accessible, andperfectly safe. Moreover, it supplies dry steam to the oven without anymaterial increase in the consumption of fuel. By reason lof the locationof the box 11 at the rear of the oven steam presses forward and coversits entire contents.

It will be obvious to those skilled in the art to which my inventionappertains that modications may be made in details Without departingfrom the spirit thereof. Hence I do not limit myself to the preciseconstruction and arrangement of parts hereinabove set forth, andillustrated in the accompanying drawings; but,

Having thus described the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. Means for generating steam and excluding products of combustionduring baking in an ordinary oven having a single fireplace arranged topreheat the baking-chamber by discharging products of combustion throughit, which comprise the combination of a damper arranged to close theofftake or exit from the baking-chamber, a water-back located in thesingle replace, and connections, substantially as described, leadingfrom the water-back to the rear of the baking-chamber and arranged todischarge steam forwardly thereby excluding products of combustion fromthe baking-chamber and conning them to the fireplace and permitting thefire to smolder and heat the water-backv and maintain such supply ofsteam during baking, substantially as described. l

2. Means for generating steam and excluding products of combustionduring baking in an ordinary oven having a single fireplace arranged topreheat the baking-chamber by discharging products of combustion throughit, which comprise the combination of a damper arranged to close theofftake or exit from the baking-chamber, awater-back located in thesingle fireplace, and connections including a storage-boiler andsteam-box leading from the water-back to the rear of the bakingchamberand arranged to discharge steam forwardly thereby excluding products ofcombustion from the baking-chamber and con-- fining them to thefireplace and permitting the fire to smolder and heat the water-back andmaintain such supply of steam during baking, substantially as described.

In testimony whereof I have hereunto signed my name.

WVM. E. STOEFFLER. In presence of- W. J. JACKSON, K. M. GILLIGAN.

